A small block of mass m slides in a vertical circular trajectory along the inside of a frictionless surface as shown.  The magnitude of the normal force at point C is 6.8mg.  The magnitude of the normal force at point A is ____ mg.

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Static and Kinetic Friction

Kinetic friction comes into existence when there are moving surfaces means in other words we can say that the force which comes into existing between moving surfaces is known as kinetic friction.